Rock-drill.



D. s. WUGH.

ROOK DRILL.

APPLwA'I'IoN NLB Ammo, 1v1-l.

Patmlted Oct. 27. 1914.

Elfbbomm/ D. S. VVAUGH.

ROCK DRILL.

APPLLUATION FILED Aviv D. s. W MGH.

ROCK DRILL.

APPLICATION FILED APR. E10. lvlL eXPiUlSlOIl DANIEL S. TAUGIL` OF DENVER, COLORADO,

ASSIGNOB TO THE DENVER BOOK DRILL MANUFACTURING COMPANY,'0F DENVER, COLORADO, A CORPORATION 0F DELAWARE.

BOOK-DRILL.

Bpeclcation. of Letters Patent. Application filed April 20, 1914. Berta! No. 833,116.

Patented Oct. 27, 1914.

To all whom it may concern:

Be it known that I, DANIEL S. WA'UGH, a citizen of the United States, residin at Denver, in the county of Denver; and of Colorado, have 'invented new "and useful Improvements in Rock-Drills, of which the following is a specification.

The present invention relates to rock drills, and more particularly those of the type ein loying a valveless motor.

One o the primary objects invention is to provide a practical structure in which a relatively 'large amount of air 1s contained within the machine so as to provide a reservoirof motive `jiuid from w ich the supply for actuating the motor ir taken.

. Another and important Objectis to provide a'structure of this type in which a' relatively large body of motive iluidhwill act upon the piston during the working stroke. This is particularly useful where a relatively low air ressure is employed and the f tiie air'is utilized 1n the operfation of the machine.`

\ chine. Fig. 2 is a longitudinal sectional l1 is a cross sectional view.

the invention that has is disclosed in wherein Anembodiment of proven entirely satisfactory, drawings,

view therethrough. Fig. 3 is a cross sectional View. Fig. f1 is a detail sectional view on the line 5-5`of Fig. 3. Fig, 5 is a view similar tol Fig. 4, but showing the valve in closed position. Fig. 6 is a detail Sectional view on the line 7--7 of Fig. 3. Fig. 7 is a view similar to Fig. 7, but showing the valve in closed position. Fig. 8 is a view in elevation of the cylinder body or t barrel, a portion thereof being broken away.

Fig. 9 is a longitudinal sectional view therethrough. Fig. 10 is an end elevation. Fig. Fig. 12 is a cross sectional view. Fig. 1B isa detail perspective view of parts of the feed piston, portions being broken away. Fig. 14 is a detail perspective view of the reservoir element with a portion broken away. Fig. 15 is a similar view of the plugelement.

Similar reference numerals designate coi-, responding parts in all the figures of the drawings.

In the motor, designated generally ence numeral 17, is employed,

by the referto the `rear tate.

of the present` 'and into and out of embodiment disclosed,l a valveless` end of which is connected the feeding means 19.

The motor 17 comprises a cylinder formed of a barrel or body 19, having a front piston chamber 20 of relatively great diameter. In the rear portion of this piston chamber, are opposite internal. enlargements forming reseivoir pockets 21. Located in the rear end bf this barrel 19, just in the rear of the said pockets 21, is a plug element 22, having a central longitudinal open-ended piston chamber 2B of less diameter than the piston chamber 20. This plug has a peripheral flan e 24 that abuts against the rear end of the arrel 19 and is clamped in position by a head block 25 that also bears against the rear end of the barrel 19. This head block has an internal tapered bore 26, in which is snugly itted the tapered end 27 of a reservoir element and partition w'all, comprising a shell having an internal chamber 28 of reater area than the piston chamber 23 an in constant communication with the rearend of the same. constitutes a constant pressure chamber from which the motive fluid is distributed, which the rear end of the smaller piston head moves without interfering with the inlet ends of the distributing ports therein.

' Operating in the cylinder memberpis a piston comprising a large front head 29 that is located in the piston chamber 20, and a smaller and lon er rear head 30 that operatcs in the sma ler piston chamber 23 and is movable back into the chamber 28, the two' heads being connected by a reduced neck portion 3l, which in eiiect forms an annular groove 32.` Motive fluid is supplied from the reservoir 28 to the rear portion of the front larger piston chamber 20 behind the head 29, through the medium of ports 33, which are formed in thel phlg 22, oponing through the rear end thereof, and into the 'front portion of the smaller piston chamber 23, where they are uncovered by the annular groove 32 when the piston moves rearwardly. Other ports or passages 34 lead from the rear portion of the piston chamber 23 outwardly through the plug 22, thence longitudinally in the cylinder barrel and open into the front end of the piston chamber 20 in advance of the head 29. Exhaust passageways 35 are cylinder 41 in advance of tue feed piston.. lt -ivill thus be evident that by turning the larly formed in the cylinder barrel 19 and. have inlet ports 36 opening through the Walls of said cylinder barrel into the piston chamber 20, the head 29 passing on opposite sides of these ports.

rIhe piston head 29 operatesagainst a tappet 37 suitably mounted in the front head 38 ot' the motor, said tappe@ in turn, operating :'.gainst the rear end o a sleeve 40 carried by the head38.

For the purpose of moving the motor to its Work and holding it in operative position, the feeding means 18 is employed. ln the particular embodiment disclosed, this eedin means comprisesal cylinder t1 having a angled head t2 that abuts against the rear face of the' head block 25, and also against a iange 43 -formed upon the reser- Voir shell 27. A collar 44, surrounding the feed cylinder' 4x1, and bearing against the flange L12, hasp'aased therethrough the side bolts 45, which' also pass through ears 46 formed onthe 'front head 38. The parts are thus held together by these side bolts.

perating in the feed cylinder 18, isapis ton which includes a head 47 threaded upon a piston rod 4:8 that projects through a plug (i9 suitably secured 1n the rear end of the cylinder 41. The outer end of this piston rod 48 is formed into a spur 50. Located upon the inner end of the head 4:7', are packing cups 51 having a washer 52 interposed between them, the outer cup also havinga Washer 53 located therein. These parts are all held against rotation by being mounted on pins 54 carried by the head 17, and they are held to said head by a cap screw 55 that passes through the various parts, and is threaded into the head.

Expansible motive fluid is supplied to the machine lfrom any suitable source, through a hose 56 connected, as shown more particuin Fig. 3, to a nipple 57 that is threaded into an enlargement 58 formed upon one side of the head block 25. This enlargement is provided with a tapered valve seat 59 formed at the inner endof the nipple 57, and in the valve seat is rotatably mounted a tapered throttle valve 60 projecting from the head block on the side opposite the nipple, said projecting end having a suitable operating handle 61a. The larger end of the throttle valve 60 is recessed, as shown at 61, and is thus in communication with the nipple. Leading from this recess, as shown in Figs. G and 7 ,'is a large' port 62, and one or more smaller ports 63 that are respectively movable into and yout of `register -with a port or passage 64, which communicates -n'ith the lfront end of the feed valve, the motive iuid must be entirely out od from the feed cylinder, as shown .in Fig.

drill-4 bit 39 detachably supported in a chuck amante 7, and by rbtating the valve, first the smaller port 63 Will be brought into register with the port 64C, then the larger port, and inally the full size port 62. Motive iuid can thus be slowly introduced into the feeding means to bring the motor slowly to its work.

The motive iiuid is conducted from the feed cylinder into the reservoir 28, and for this purpose, Vthe, enlargement 58 of the head bloclr25 is provided with a pair of convergently -disposed ports 65 that open, respectively, into the feed cylinder and the reservoir, and also open through the valve seat 5.9. The .thrttle val-ve 60 has a passageway 66 that communicates with both ports 65 When the port 62 is in communication With the ort 64. As a consequence, the motive 'lui will first enter the feeding means 18 and pass thence into the reservoir 28. The supply of motive fluid to the feeding means and to the motor, is, however, controlled by the `single throttle valve 60.- ll? or the` irpose of vturning the machine, a handle i s mounted on v the side or" the head block opposite the throttle valve, and this reservoir 68 that communicates with the interior of the machine.

Briefly described, the operation is substantially as follovvsz--The spur 50, having been placed against a rock or other support, air is first slowly admitted to the feed bar by turning the valve 60, so that the machine is brought up to ther Work. |The throttle valve is then turned to fully open position, and the motive Huid will flow into ythe feeding means, and thence4 into the reservoir chamber 28. Constant pressure of the motive fluid is thus against the rear end of the smaller piston head 30,4and said head furthermore constitutes means for controlling the distribution of this motivefluid from the reservoir to the piston chambertQO on opposite sides of the larger head 29. For example. assuming the parts in the position shown 1n Fi 2, the exhaust passages 3536 are open 1n rear of the head'29, and the head 30 is far enough forivaid taexpose the pasf sage 34C, so that the motive fluid will pass from the reservoir u28 into the piston chainber 20 in advance of the piston head 29. rl`he piston will thus be driven rearwardly. The exhaust ports 36 will, however, be quickly closed, so that ther motive iuid behind the head 29 will be compressed. in like manner, the port 3l: will be quickly closed by the rear head 30 and the continued rearward movement of the piston depends upon the expansion of the motive liuid in advance of the head 29. l This continues until the head 29 has passed the exhaust port 3G, whereupon the motive luid Will exhaust in advance of the head 29. By this time, the annular groove 32, formed by the neck 31 which connects the two piston 90 handle is made tubular, forming a lubricant heads 29 and 30, will have uncovered the Orts The motive fluid will thus flow trom the reservoir 28, through said groove into the 4piston chamber 20, behind the head 29. The pressure against the rear face of' the front head 2), assisted bythe pressure against the rear head 30 Wi l rially .increases the drilling capacity of the machine.

From the foregoing, it is thought that the construction, operation, and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction, may be resorted to without dcpartin from the spirit or sacrificing any of the a vantages of the invention.

Having thus fully described my inven tion, what I claim as new and desire to se- Y cure by Letters Patent, is:

1. In apparatus of the character set forth, the combination with a c linder member havingr a front piston cham er of relatively large diameter, a rear piston chamber of smaller diameter communicating with the 'front chamber and an enlarged constant pressure chamber in rear of the rear piston hamber of greater diameter than the same ind crm'imunicating therewith, of a piston omprisng a front head operating in the ront piston chamber, a rear head operating in the` rear chamber and a reduced neck portion connecting the pistons, means for supplying motive flliid to the enlarged conetant pressure chamber and thereby maintaining a constant pressure therein and against the rear end of the smaller piston Head, and ports leading from the enlarged onstant pressure chamber and controlled y the piston of smaller diameter 'for delivering 'motive fluid from the enlarged pressure chamber to the front piston chamber on opposite sides of lthe enlarged piston Head therein.

2. In apparatus ot the character set forth, lhecombination with a cylinder member mving a front piston chamber ot' relatively large diameter, a rear piston chamber of sn'ialler diameter communicating With the front chamber and an enlarged constant drive the,Y piston forward on its working stroke, andi this stroke will continue even after the ports 33 are closed by the head 30 because of the' pressure chanber in rear of the rear piston chamber oi ai cater diameter than the same and communicating therewith, of a piston comprising a front head operating in the front piston chamber, a rear head operating in the rear chamber and a reduced neck portion connecting the pistons, means for supplying motive fluid to the enlarged constant pressure chamber and thereby mainltaining a constant pressure therein and against the rear end of the smaller piston head, and ports leading from the enlarged constant pressure chamber and controlled by the piston of smaller diameter for deliv- @ring motive fluid from the enlarged pressure chamber to the front piston chamber on opposite sides of the enlarged piston head therein, the rear end of said smaller piston entering the enlarged constant pres-- sure chamber 1n spaced relation to the Walls thereof and to the inlet ends of certain of said ports.

3. In apparatus of the character set forth, a valveless motor, comprising in combination, a cylinder member having a roar piston chamber of relatively small diameter and a front piston chamber of greater diameter, a piston in the cylinder member having portions of different diameters operating respectively in the different chambers, a motive fluid reservoir in rear of the smaller piston chamber of greater diameter than the same and having constant communication with the rear end thereof, means for supplying motive fluid to the reservoir and thereby maintaining constant pressure against the rear end of the piston, and means controlled by the portion of the piston operating in the smaller piston chamber for distributing motive fluid from the reservoir to the larger piston chamber on opposite sides of the portion of the piston operating therein.

4. 'In apparatus of the character set forth, a valvcless motor, comprising in combination, a cylinder member having a body rovidcd with n plurality of piston cham c'rs of different diameters andra rear head block mounted on the body and having an enlarged reservoir in constant communication 'with thc rear piston chamber. a piston in the cylinder member having portions of different diameters operating respectively in the different chambers, one of said portions being movable into and out of the reservoir, means for supplying motive fluid to the reservoir, and means controlled by the movements oi the piston for distributing the motive fluid to cause the operation of said piston.

5. In apparatus of the character set forth, a valveless motor, comprising in combination a cylinder body having an enlarged front piston chamber, a plug detachably l fitted in the rear end of the body and having a smaller piston chamber, and a head block secured to the rear end of the cylinder body and having a motive fluid reservoir communicating With the rear end of the smaller piston chamber, a piston operating in `the cylinder and having portions of different diameters located respectively in the piston chambers, means for supplying motive fluid to the cylinder member, and distrilrating Lports controlled by the ortion of the piston operating in 'the smal er piston chamber i'or distributing the motive fluid from the reservoir to the larger piston chamber on opposite sides of the polrtionof the piston. therein.

G. In apparatus of the character set fort-h, the combination With a cylinder member haring a piston chamber, of a piston having a portion operating in the piston chamber, said piston chamber having a reservoir pocket that opens solely thcreinto, the open portion beingr located always in rear of the portion of the piston operating in the said piston chamber, and means for delivering motive uid into the piston chamber to opn erate the piston, said motive fluid periodi- Vcally filling the piston chamber behind the piston and also the pocket to :form a rela-- tively large body ot fluid behind said piston on its Working stroke.

7. In apparatus ot the character set forth, the combination with a; cylinder member having a piston chamber, of a piston having a portion operating in the piston chamber, said piston chamber having a plurality ot reservoir pockets that open solely theremto, the open portions beingr located always in rear of the portion of the iston operating in said piston chamber, and) means separate vfromthe pockets for delivering motive fluid into the piston cliamber to operate the piston, said motive iuid periodically filling the piston chamber behind the piston and also filling the pockets to form a relatively large body of fluid behind said piston on its Working-stroke.

8. In apparatus of the character described, the combination with' a cylinder member having a front large piston chamber and a rear smaller piston chamber, said larger pist-on chamberhaving in its rear portion an. internal enlargement forminga reservoir pocket, of a piston having ,portions of different diameters operating respectively in the piston chambers, the larger portion being,r disposed at all times inadvance of the pocket, and mean for distributing motive fluid to the lamer piston chamber.

9. In apparatus of the character described, the combination with a cylinder member having a front large piston chamber provided in its rear portion withv internal enlargements forming reservoir pockets, of aplup; located in rear ofthe enlargements and having a smaller piston chercher, anda pis- Lll. 3.45949 ton operating in the cylinder member and having portions of dierent diameters operatingrespectively in the dierent chambers, said cylinder member, and plug having ports controlled by the portion of the piston operating in the smaller iston chamber for distributing motives fluid to the larger -pistoia chamber on opposite sides of the portion of the piston operating therein, said portion,

operating in advance of the p kots.

l0. llo apparatus of the character 'set' forth, the combination with a cylinder i: fiember having a front piston chamber oi rela-4 tively large diameter and a rear piston charnber of smaller diameter communicating' with the front chamber, of a piston comprising; e, front head operating in the front piston chamber and a smaller rear head operating in the rear chamber, said front piston cham-7 ber having a reservoir pocket that opent; solely thereinto, the open portion being located in rear of the enlarged piston henri. operating in said piston chamber, and means controlled by the' smaller piston head for delivering); motive fluid into the front piston chamber in rear of the large piston head, said motive fluid periodically filling the piston chamber behind the enlarged piston head and also filling' the pocket to form a relatively large body of fluid behind said piston head on its working stroke.

1l. In apparatus of the character set forth, the combination with a valvelcss motor, in cludingi a cylinder member havin chambers of diierentjdiameters, o a. head block for the rear end of the cylinder member having an enlarged reservoir in constant communication with the rear piston cham# ber, a piston having' portions ot diierent diameters operating respectively in the pis-= portstor distributing motive fluid to the for- Ward piston chamber on opposite sidesvof the portionl of the lpiston o erating therein, said ports libeingcontrolle ,by the portion of the pistpn operating in the rear piston chamber, eedingimeans connected to `Jthe head block and comprising a cylinder andfaI piston operatin therein, means ror'deliver ing motive iui through the head lblock into the feeding means and for directing,l it from said feeding' means into the reservoir, and a throttle valve located in one side of the head block for controllin both the supply of motive iuid to the yfee ing means and its paspiston .r

sage from said feeding means into the reserl 'ment forming a reservoir pocket that is freely open into the rear portion of the pis-- ton chamber, a piston member operating in the chamber and being always dispose in rer yadvance or the open end of thepocket, and aan 16"; ton chambers,-said cylinder member having means for delivering motive fluid into the my hand in presence of two subscribing witpiston chamber to operate the piston, said nesses. motive Huid periodically filling the piston chamber behmd the piston and also the DANIEL SWAUGH `5 pocket, to form a reletivelyvlarge body `of Witnesses:

Huid. JAS. R. ELMENDORF,

In testimony whereof I have hereunto se; C. El. KAIsmx. 

